... ismissing, Excel will not call the function, and will fail with a#VALUE! error.102 Excel Add- in Development in C/ C++Using the C+ + xloper class cpp_xloper, introduced in section 6 .4, the above codecan ... library and header file, or COM (see section 9.5). (See also section 4. 12 below, and Chapter 5Turning DLLs into XLLs: The Add- in Manager interface on page 94. )96 Excel Add- in Development in C/ C++explanation ... 79 4. 6 FUNCTION CALLING CONVENTIONS:cdecl, stdcall, fastcallThe Microsoft-speci c keyword modifiers, __cdecl, __stdcall and __fastcall,are used in the declaration and prototyping of functions...